This is a 56-hour chronometer with indications of hours, minutes, seconds, and up and down, that has a modern pattern Earnshaw, spring detent escapement. It was made in the 1830s. The U.S. Navy Bureau of Ships transferred it to the Smithsonian in 1953. Richard Widenham received an award at the chronometer trials at the Royal Greenwich Observatory in 1825, and began trading as Widenham & Adams in 1840. Ref: Tony Mercer, Chronometer Makers of the World (Colchester, 199), p. 256.
